5.) Q: How many satellites are needed for 3-D positioning?5.) A: A minimum of 4 satellites.

6.) Q: What platforms are supported?6.) A: Pocket PC

7.) Q: Why are customers having problems with O2 XDAIIi with this GPS model?7.) A: We tested the SDIO/O2 XDAII, it works well. It looks like no compatible problem. However, two possible reasons and solutions below are for your reference:- An out-of-date image version: The one we tested is using ROM Revision 1.00.01 ENG. You can down load the updated one from the web site of O2 XDAII at http://www.my-xda.com/xda2_soft.html -- A contact fault: It may need to replace it by a new one

8.) Q: Having trouble getting the driver to install on my HP iPAQ h2210 series. What is needed to function?8.) A: There is a know issue with the compatibility between SD GPS's and the iPAQ 2210 PDA's. Two solutions you may want to consider: 1.) Un-install the driver, re-boot the PDA and then re-install. Some users report success after making multiple attempts to install the driver. 2.) Try updating the PDA's ROM. Caution: DO NOT attempt if you are not familiar with these kinds of O/S updates as you could cause permanent damage to your PDA's O/S if done incorrectly. http://selfservice.talisma.com/display/2/index.asp?c=27&cpc=6ITL8W331lHO4ae4y3 74f8RqmM25sBFnYPc&cid=21&cat=&catURL=&r=0.4397089

10.) Q: Will my receiver support older NMEA standards?10.) A: Yes, NMEA 2.0 is backwards compatible with older versions of the protocol. NOTE: If your map software (such as Street Atlas 5) requires datasentence GGA, and your GPS (such as the Magellan 3000) does not output GGA, then they will NOT work together. Will my receiver support older NMEA standards?

11.) Q: What to look for first to know which SiRF firmware version is oldest/newest?
11.) A: Here's a little insight into SiRF version numbers: 2.3.2-GSW2-2.05.024-C1PROD1.0_6A -- the GSW2 means standard SiRFStar II software, and 2.3.2 is the release version number. The 2.05.024 or similar numbers are internal numbers into the engineering data base. C1 is the build variant, a number that varies with each software type, but can relate to flash builds vs. RAM (debug) builds, builds with or without SBAS support (WAAS), builds with one or two serial port support, NMEA or binary protocol default, etc. Prod means this is a released rather than a beta (test) version. 1.00 means the release is without any post-release bug fixes. If there is a letter or letters after the Prod1.00, like Prod1.02b, this would mean that some specific "patches" have been added to provide interim fixes for known bugs. After that, anything on the line is likely added by the manufacturer for internal version control. A number like 2.4.12.07-XMitac2.0-C1BETA1.1 0000003729 with XMitac2.0 means this is XTrac 2.0 customized by SiRF for Mitac. In general, an X in the number will imply XTrac software, while GSW2 or GSW3 will indicate standard code for SiRFStar II or SiRFStar III, respectively.

12.) Q: Can we upgrade our SiRF firmware? What' s needed for the process?12.) A: SiRF provides the new versions to our direct customers, but it is up to them to determine if they want to provide an update mechanism to their end-user customers. While the process is relatively simple, unless there is a hardware way to put the receiver into flash upgrade mode (internal boot mode is our term) there is a chance to get things stuck so you have to send it back to the manufacturer or a repair depot to recover. Further, you must be supplied with a flash programming utility to do the job since you cannot access the flash directly -- you have to go through the ARM processor on the SiRF chipset."

13.) Q: What is the meaning of "baud rate"?13.) A: Baud rate is really the rate of bit transitions on the serial data link. Since each byte of data adds a start and stop bit, it is 10 bits long, and 38400 baud is 3840 bytes per second. Faster bit rates transfer more bytes per second, i.e., greater bandwidth.

14.) Q: What is static navigation?14.) A: Static navigation when enable, velocities lower than 1.2 m/s for 3 seconds we will freeze the position, and leave them frozen until velocity exceeds 1.4 m/s. Static navigation is a mode designed for motor vehicles, which causes the position to become pinned at one location when velocity is determined to be low enough. This is designed to make navigation systems operate more reasonably when the GPS Selective Availability (SA) signal degradation is turned on.

15.) Q: What is trickle mode?15.) A: The Trickle mode allows for an increase in battery life by putting the GPS module in sleep mode for very short periods of time, such as 300ms per 1s cycle, which will result in a battery life increase of about 40% according to my testing. It can be useful for certain types of applications but there is a hit on performance as the receiver will have to get "back on its feet" when it wakes up. It is especially problematic in difficult reception conditions. Starting with FW 2.3, SiRF has added the "Adaptive Trickle" mode, which as its name implies will adapt the power savings to the conditions of reception. In optimal conditions, I found that the battery life increase amounts to about 30%.

16.) Q: How can I find whether my device is an X-Trac or STD model?16.) A: There are several ways to check whether the device is X-Trac or not: 1. Serial number is X....., it's X-Trac 2. The bottom sticker with Red dot, it's X-Trac 3. Use GPSinfo to cold start the device, it shows Xtrac after $Version, it's X-Trac.